Thermal Resistance of Graphite Plastics Based on Aromatic Polyamide

Abstract

The paper presents the results of studying graphite plastics based on heat-resistant polyamide by thermogravimetric analysis (TGA), as well as the determination of mechanisms and kinetic parameters by the Koats-Redfern method. Based on the results of the thermal analysis, the mechanisms and kinetic parameters of the thermal destruction process were determined, namely: graphite injection increases the heat resistance of graphite plastics by 2 (graphite content 10% by weight)-22% (graphite content 50% by weight) and reduces the activation energy of the process thermal destruction almost 2 times. This makes it possible to improve the technological parameters for the production of polymeric composite materials, which are limited by a narrow interval between the flow temperatures and the thermal destruction of phenylone C-2.

New insights into the biodegradation of polylactic acid: from degradation to upcycling

“…In addition to complete degradation and mineralization, another promising approach to disposing of waste plastics is "upcycling". For instance, during the recycling process of polyurethanes, new polyesters can be synthesized from the carboxylic acids and alcohols via the polycondensation process (Debuissy et al 2017), while polyamides could be obtained from the recovered amines building blocks (Hablot et al 2010;Burya et al 2018). As the biodegradation products of PET, D r a f t the monomers of terephthalic acid and ethylene glycol can be reused for the synthesis of value-added products such as metal-organic frameworks (Manju et al 2013) and biodegradable polyhydroxyalkanoates (Wierckx et al 2015).…”

Development of the Protection Coat for Metallic Structures Based on the Intercalated Graphite Compounds

“…This is due to the peculiarities of its physicochemical properties [18,20]. Natural graphite has a high electrical conductivity (1000-1400 Ohm•m 2 /m) and heat resistance, the melting point is 3850±50 ○ С [1][2][3][4][5][6][7]. On the other hand, the presence of materials with a low bulk density of particles in the composition of protection coat contributes to an increase in protective properties due to low adhesion to molten metal spiting, high thermal insulation capacity, and increased heat resistance.…”

“…With these, the reaction of obtaining low-density graphite is of interest. Graphite, being an allotropic modification of solid carbon, has a characteristic structural feature -the presence of extended hexagonal flat graphene networks of carbon atoms in two-dimensional space and a weak attraction of the Van der Waals type between the layers [3,[6][7][8][9].…”

“…Intercalated graphite compounds are widely used in various industries, which is explained by their unique ability to increase their apparent volume by 50-1000 times when heated, followed by the formation of a low heat-conducting layer [1][2][3][4]. A wide range of intercalated graphite compounds is used as packing and sealing materials at the fuel and energy, refining complexes, as fire-protective materials for extinguishing fires, as heat-shielding materials in the foundry industry, and also in the heat treatment of parts as a cooling medium to ensure a given speed of slow cooling [5][6][7]. The efficiency and manufacturability of using intercalated graphite compounds in various production processes are ensured by the possibility of the thermal expansion temperature chemical regulation within a wide range from 200°C to 1200°C [8][9][10][11].…”

The Role of Surface Treatment and Coupling Agents for Adhesion between Stainless Steel (SUS) and Polyamide (PA) of Heterojunction Bilayer Composites

“…Polyamides, also named nylon, feature high mechanical strength, wear resistance, flexibility, chemical and thermal resistance, low friction coefficients, and electrically insulating properties and are lightweight [29][30][31][32][33][34][35]. Thus, it is extensively utilized in various applications, such as textiles, automotive applications, electronics, packaging, sports equipment, kitchen utensils, carpet fibers, and various household items, despite moisture absorption [36][37][38][39][40][41][42].…”